I get no error messages at all in the terminal.

Sent from my iPad

> On 28/03/2018, at 12:57 PM, Steven Sykes <[email protected]> 
> wrote:
> 
> Do you get useful errors messages if you try and launch respective 
> applications from within a terminal?
> 
> Cheers,
> Steven Sykes
> Computer Science and Software Engineering, University of Canterbury
> Chair, linux.conf.au 2019 conference
> Twitter: @linuxconfau2019
> Web: lca2019.linux.org.au/
> 
> <2019Logo-mini.png>
>> On 28/03/18 12:55, [email protected] wrote:
>> Yesterday on boot up and numerous reboots, Mint 18 Mate confronted me with 
>> something I've never seen before.  A few icons had disappeared from the dock 
>> (network, update). Multiple applications that I use every day refused to 
>> launch. They gave no error messages. Trying to launch from the GUI, the 
>> "Starting (name of application) bar would appear on the panel, then after a 
>> few seconds, nothing.  Trying to launch from the terminal, nothing, even 
>> appending -v or -vv to the command.  I tried running as root via sudo, same 
>> result.
>> 
>> The non functioning applications included Firefox, Chromium, Thunderbird, 
>> the network manager when called from Settings, the PDF viewer (whether 
>> invoked from the menu or by double-clicking a .pdf document's icon), and 
>> Synaptic.
>> 
>> Applications that seemed to be working normally included the Caja file 
>> manager, the display manager, Moneydance, the terminal and, as I then 
>> discovered, apt-get.
>> 
>> With respect to each of the nonfunctioning applications for which I tried 
>> apt-get install, apt-get told me it was already installed and at the latest 
>> version.
>> 
>> I was able to install Midori and xpdf, and they both worked.  When I then 
>> tried removing and reinstalling Thunderbird, though, it did remove and 
>> reinstall but it still wouldn't launch.  Thunderbird's data files seem 
>> mostly OK, although one or two of the mail sub folders may be duplicated.
>> 
>> I have a quite up to date backup of my home folder, so if I have to 
>> reinstall the OS it's a nuisance rather than a tragedy, but is there any 
>> other way forward anyone can recommend?
>> 
>> TIA - Andrew
>> 
>> Sent from my iPad
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